LGTM3 On Wednesday, August 5, 2026 at 7:43:03 AM UTC-7 Daniel Bratell wrote:
> LGTM2 > > /Daniel > On 2026-08-05 08:52, TAMURA, Kent wrote: > > LGTM1. Interoperability/compatibility risk is very low. > > > On Wed, Aug 5, 2026 at 6:24 AM Javier Fernandez <[email protected]> > wrote: > >> *Contact emails* >> [email protected] >> >> *Specification* >> https://www.w3.org/TR/css-typed-om-1/#stylevalue-subclasses >> >> *Summary* >> The CSS Typed OM spec exposes the CSSStyleValue hierarchy to worker >> global scopes ([Exposed=(Window, Worker, PaintWorklet, LayoutWorklet)]), >> but Blink only exposed CSSStyleValue, CSSKeywordValue, CSSNumericValue, >> CSSUnitValue and CSSUnparsedValue to Window and the worklets. As a result >> these constructors were undefined in Workers, unlike in Firefox and Safari. >> >> *Blink component* >> Blink>CSS >> <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3ECSS%22> >> >> *Web Feature ID* >> css-typed-om <https://webstatus.dev/features/css-typed-om> >> >> *Motivation* >> Aligns Chrome with the spec's [Exposed] set and removes a cross‑thread >> inconsistency (these constructors are currently undefined in workers); >> enables off‑main‑thread CSS value manipulation >> >> *Initial public proposal* >> *No information provided* >> >> *TAG review* >> *No information provided* >> >> *TAG review status* >> Not applicable >> >> *Goals for experimentation* >> None >> >> *Risks* >> >> >> *Interoperability and Compatibility* >> This feature is already shipped by Firefox and Safari and it's purely >> additive worker‑scope exposure; zero change to existing Window behavior; >> matches the spec. Only theoretical risk: content that feature‑detects these >> globals inside a worker >> >> *Gecko*: Shipped/Shipping >> >> *WebKit*: Shipped/Shipping >> >> *Web developers*: No signals >> >> *Other signals*: >> >> *WebView application risks* >> >> Does this intent deprecate or change behavior of existing APIs, such that >> it has potentially high risk for Android WebView-based applications? >> *No information provided* >> >> >> *Debuggability* >> No special tooling; interfaces work in the worker DevTools console like >> any other worker‑exposed API >> >> *Will this feature be supported on all six Blink platforms (Windows, Mac, >> Linux, ChromeOS, Android, and Android WebView)?* >> Yes >> >> *Is this feature fully tested by web-platform-tests >> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?* >> Yes >> css/css-typed-om/stylevalue-subclasses/*.any.js (global=window,worker): >> cssKeywordValue, cssKeywordValue-value, cssUnparsedValue-empty, >> numeric-objects/cssUnitValue-to; and (full‑scope) the converted >> create-a-type, cssMathInvert-type, cssMathNegate-type, add-two-types, >> cssnumericvalue-multiply-two-types, arithmetic, to .any.js. (The CSSMath* >> ones require the full‑scope exposure.) >> https://wpt.fyi/results/css/css-typed-om/stylevalue-subclasses?label=experimental&label=master&aligned >> >> *Flag name on about://flags* >> *No information provided* >> >> *Finch feature name* >> *No information provided* >> >> *Non-finch justification* >> This is just a minor CSS change to allow some CSS javascript bindings to >> be run in Worker context, but that were already exposed to the Web via >> Window context. >> >> *Rollout plan* >> Will ship enabled for all users >> >> *Requires code in //chrome?* >> False >> >> *Tracking bug* >> https://issues.chromium.org/issues/534781956 >> >> *Estimated milestones* >> Shipping on desktop 153 >> Shipping on Android 153 >> Shipping on WebView 153 >> >> *Anticipated spec changes* >> >> Open questions about a feature may be a source of future web compat or >> interop issues. Please list open issues (e.g. links to known github issues >> in the project for the feature specification) whose resolution may >> introduce web compat/interop risk (e.g., changing to naming or structure of >> the API in a non-backward-compatible way). >> https://github.com/w3c/csswg-drafts/issues/14229 >> >> *Link to entry on the Chrome Platform Status* >> https://chromestatus.com/feature/5114591051907072?gate=6116938171416576 >> >> This intent message was generated by Chrome Platform Status >> <https://chromestatus.com/>. >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "blink-dev" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion visit >> https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0786569a-3c4b-421c-af22-a6bc4a717ccc%40igalia.com >> >> <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0786569a-3c4b-421c-af22-a6bc4a717ccc%40igalia.com?utm_medium=email&utm_source=footer> >> . >> > > > -- > TAMURA Kent > Software Engineer, Google > > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGH7WqFXhBZPTvHif0oH5AuOfatxZejZ%2BPNuBPrUdZo8N62M5Q%40mail.gmail.com > > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAGH7WqFXhBZPTvHif0oH5AuOfatxZejZ%2BPNuBPrUdZo8N62M5Q%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/1d202d69-90dc-4acd-bb81-d39b7ddcd5c1n%40chromium.org.
